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1.国家电网有限公司西北分部,陕西省西安市 710048
2.清华大学电机工程与应用电子技术系,北京市 100084
3.清华四川能源互联网研究院,四川省成都市 610042
Received:22 February 2023,
Revised:2023-09-13,
Published Online:24 January 2024,
Published:10 March 2024
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FAN Yue,CHEN Ying,HUO Chao,et al.Mechanism Analysis and Correction Method for Overvoltage of Renewable Energy Station Affected by Transformer Magnetic Saturation[J].Automation of Electric Power Systems,2024,48(5):99-106.
范越,陈颖,霍超等.新能源场站过电压受变压器磁饱和影响机理分析及修正方法[J].电力系统自动化,2024,48(5):99-106. DOI: 10.7500/AEPS20230222004.
FAN Yue,CHEN Ying,HUO Chao,et al.Mechanism Analysis and Correction Method for Overvoltage of Renewable Energy Station Affected by Transformer Magnetic Saturation[J].Automation of Electric Power Systems,2024,48(5):99-106. DOI: 10.7500/AEPS20230222004.
文中研究新能源基地经直流外送系统中变压器磁饱和特性对过电压的影响,揭示变压器磁饱和特性影响新能源场站过电压的机理。首先,介绍了有无变压器磁饱和特性建模时新能源场站并网点过电压仿真结果的差异。其次,介绍了变压器的电磁暂态仿真模型及其磁饱和特性的建模方法。然后,论证了过电压发生时变压器的磁饱和特性将使其吸收无功功率,并推导了无功吸收量与电压之间的关系。接着,针对未考虑变压器饱和特性的算例提出了过电压仿真结果修正方法。最后,通过小型测试案例及西北全网测试案例,验证了所提出的理论及修正方法的正确性与可行性。
This paper studies the influence of transformer magnetic saturation characteristics on overvoltage in the DC transmission system of renewable energy bases
and reveals the mechanism for the overvoltage of renewable energy stations affected by transformer magnetic saturation characteristics. Firstly
the differences in simulation results of overvoltage at the grid connection points of renewable energy stations with or without the modeling of the magnetic saturation characteristics of transformers are introduced. Secondly
the electromagnetic transient simulation model of transformers and the modeling method of the magnetic saturation characteristics are introduced. Then
it is demonstrated that the magnetic saturation characteristics of the transformer during overvoltage would make it absorb reactive power
and the relationship between reactive power absorption and voltage is derived. Subsequently
a method for correcting overvoltage simulation results is proposed for cases that do not consider transformer saturation characteristics. Finally
the correctness and feasibility of the proposed theory and correction methods are verified through small-scale testing cases and a northwest China grid testing case.
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